The Sleepy Hollow Creek to Olympic Nf Boundary whitewater river run in Washington State is a popular destination for experienced whitewater enthusiasts. The ideal streamflow range for this section of the river is between 800 and 3000 cfs. The class rating for this section of the river ranges from Class III to Class IV, depending on the water level.

This river run covers a distance of approximately 11 miles, starting at the Sleepy Hollow Creek and ending at the Olympic National Forest Boundary. Along the way, there are several rapids and obstacles to navigate, including "The Elbow," "The Pinball," and "The Slot."

It is important to note that this section of the river is only recommended for experienced kayakers and rafters, as it can be dangerous for those with limited experience. Additionally, there are specific regulations in place for this area, such as the requirement for a valid permit from Olympic National Park and the prohibition of jumping from any bridges or cliffs.